<template>
  <Select
    v-bind="$attrs"
    :open="isOpenOptions && ((Array.isArray(state) && state.length > 0) || (!Array.isArray(state) && state !== ''))"
    @change="handleChange"
    @select="handleSelect"
    @focus="handleFocus"
    @blur="handleBlur"
    @mouseenter="handleMouseenter"
    @mouseleave="handleMouseleave"
    @mousedown="handleMousedown"
    @search="handleSearch"
    :filterOption="false"
  >
    <!-- :options="customOptions ? undefined : getOptions" -->
    <template #[item]="data" v-for="item in Object.keys($slots)">
      <slot v-if="item !== 'customOptions'" :name="item" v-bind="data || {}"></slot>
    </template>
    <slot name="customOptions" v-bind="getOptions || []"></slot>

    <template #suffixIcon v-if="loading">
      <LoadingOutlined spin />
    </template>
    <template #notFoundContent v-if="loading">
      <span>
        <LoadingOutlined spin class="mr-1" />
        {{ t("component.form.apiSelectNotFound") }}
      </span>
    </template>
  </Select>
</template>
<script lang="ts">
  import { defineComponent, PropType, onUnmounted, ref, watchEffect, onMounted, computed, unref, watch } from "vue"
  import { Select } from "ant-design-vue"
  import { isFunction } from "/@/utils/is"
  import { useRuleFormItem } from "/@/hooks/component/useFormItem"
  import { useAttrs } from "/@/hooks/core/useAttrs"
  import { get, omit } from "lodash-es"
  import { LoadingOutlined } from "@ant-design/icons-vue"
  import { useI18n } from "/@/hooks/web/useI18n"
  import { propTypes } from "/@/utils/propTypes"
  // 防抖动
  import { debounce } from "lodash"

  type OptionsItem = { label: string; value: string; disabled?: boolean }

  export default defineComponent({
    name: "ApiSelect",
    components: {
      Select,
      LoadingOutlined,
    },
    inheritAttrs: false,
    props: {
      value: [Array, Object, String, Number],
      numberToString: propTypes.bool,
      api: {
        type: Function as PropType<(arg?: Recordable) => Promise<OptionsItem[]>>,
        default: null,
      },
      // api params
      params: {
        type: Object as PropType<Recordable>,
        default: () => ({}),
      },
      // support xxx.xxx.xx
      resultField: propTypes.string.def(""),
      labelField: propTypes.string.def("label"),
      valueField: propTypes.string.def("value"),
      immediate: propTypes.bool.def(false),
      customOptions: propTypes.bool.def(false),
    },
    emits: ["options-change", "change", "update:value", "select"],
    setup(props, { emit }) {
      const options = ref<OptionsItem[]>([])
      const loading = ref(false)
      const preParam = ref()
      const emitData = ref<any[]>([])
      const attrs = useAttrs()
      const { t } = useI18n()
      const isChange = ref(false)
      const searchValue = ref<any>()
      const isOpenOptions = ref<boolean>(true)
      const isMouseenter = ref<boolean>(false)

      // Embedded in the form, just use the hook binding to perform form verification
      const [state, setState] = useRuleFormItem(props, "value", "change", emitData)

      const getOptions = computed(() => {
        const { labelField, valueField, numberToString } = props
        return unref(options).reduce((prev, next: Recordable) => {
          if (next) {
            const value = next[valueField]
            prev.push({
              ...omit(next, [labelField, valueField]),
              label: next[labelField],
              value: numberToString ? `${value}` : value,
            })
          }
          return prev
        }, [] as OptionsItem[])
      })

      watchEffect(() => {
        props.immediate && fetch()
      })

      watch(
        () => props.params,
        () => {
          if (JSON.stringify(preParam.value) === JSON.stringify(props.params)) {
            return
          }
          fetch()
          preParam.value = props.params
        },
        { deep: true }
      )

      async function fetch() {
        const api = props.api
        if (!api || !isFunction(api)) return
        options.value = []
        try {
          loading.value = true
          const res = await api(props.params)
          if (Array.isArray(res)) {
            options.value = res
            emitChange()
            return
          }
          if (props.resultField) {
            options.value = get(res, props.resultField) || []
          }
          emitChange()
        } catch (error) {
          console.warn(error)
        } finally {
          loading.value = false
          //判断选择模式，multiple多选情况下的value值空的情况下需要设置为数组
          unref(attrs).mode == "multiple" && !Array.isArray(unref(state)) && setState([])
        }
      }

      async function handleFetch() {
        await fetch()
      }

      function emitChange() {
        emit("options-change", unref(getOptions))
      }

      function handleChange(_, ...args) {
        emitData.value = args
      }

      const handleFocus = () => {
        isOpenOptions.value = true
      }
      const handleMouseenter = () => {
        isMouseenter.value = true
      }
      const handleMousedown = () => {
        isOpenOptions.value = isMouseenter.value
      }

      const handleMouseleave = () => {
        isMouseenter.value = false
        isOpenOptions.value = isChange.value ? isOpenOptions.value : true
      }

      const handleBlur = (value) => {
        if (state.value === "" || !options.value || options.value.length === 0) {
          isOpenOptions.value = false
        }
        console.log("handleBlur: ", value)
      }
      const doSearch = async (keyword, option) => {
        isChange.value = false
        console.log("keyword", state.value)
        await handleFetch()
      }
      const handleSelect = (value) => {
        isChange.value = true
        setState(value != null && value != "" ? value : undefined)
        console.log("handleSelect: ", state.value)
        isOpenOptions.value = false
        emit("select", unref(state))
      }
      const handDebounceSearch = debounce(doSearch, 1000) //防抖1s

      const handleSearch = (value, options) => {
        try {
          setState(value || "")
          emit("update:value", unref(state))
          if (state.value === "") {
            isOpenOptions.value = false
            return
          }
          isOpenOptions.value = true
          loading.value = true
          handDebounceSearch(value, options)
        } catch (e) {
          loading.value = false
          console.log("error", e)
        } finally {
        }
      }

      const reset = () => {
        setState("")
      }

      onUnmounted(() => {
        handDebounceSearch.cancel()
      })

      return {
        state,
        attrs,
        getOptions,
        loading,
        t,
        isChange,
        searchValue,
        isOpenOptions,
        handleFetch,
        handleChange,
        fetch,
        handleMousedown,
        handleFocus,
        handleMouseenter,
        handleMouseleave,
        handleBlur,
        handleSearch,
        handleSelect,
        reset,
      }
    },
  })
</script>
